- What: New schemas/attribution.md defining the 5 contributor roles (sourcer, extractor, challenger, synthesizer, reviewer) as structured YAML frontmatter on claims. Updated schemas/claim.md to reference it.
- Why: Cory directive — attribution must be public from day 1. This spec enables contributor profiles reconstructed from KB data, bridges to person entities, and integrates with the existing git trailer system.
- Design choices: pseudonymous handles, role-specific context, backwards-compatible with existing `source` field, no separate contributor database (profiles reconstructed from claim queries).
Pentagon-Agent: Rio <760F7FE7-5D50-4C2E-8B7C-9F1A8FEE8A46>